Perhaps you should try some spelling variations:
thanh hoai » thanh hoa, thanh hai, thanh oai
ban thanh » ban hanh, ban hang
cach dua » cach cua, cach dung, cac du
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
va cach » va cac
dua ban » dia ban, cua ban, qua ban
cua tre » cuu tre, cua triet, dua tren
y nang » ky nang, ly nang, v nang
cua te » cua tu
x hoi » xa hoi, o hoi, 5 hoi

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach y nang ((x hoi) or (x ho)). hieu va cach dua ban thanh hoai ((cua tre) OR (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang ((x hoi) OR (x ho)). hieu va cach dua ban thanh hoai ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang ((x hoi) or (x ho)). hieu va cach dua ban thanh hoai ((cua tre) OR (cua te))".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang ((x hoi) or (x ho)). hieu va cach dua ban thanh hoai ((cua tre) OR (cua te))*.